Borrowing it
Nothing to install: this file belongs to donnfelker/loop-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/donnfelker/loop-skills/main/AGENTS.mdgit clone --depth 1 https://github.com/donnfelker/loop-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/donnfelker/loop-skills/agents-md)<a href="https://agentmods.dev/instructions/donnfelker/loop-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/donnfelker/loop-skills/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/donnfelker/loop-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/donnfelker/loop-skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.01257 | $0.01257 |
| Opus 5.5 | $0.00503 | $0.00503 |
| Sonnet 5.5 | $0.00251 | $0.00251 |
| Haiku 4.5 | $0.00126 | $0.00126 |
Grade A, and why
loop-skills AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 98 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Guidelines for AI agents working in this repository.
Repository Overview
This repository contains Agent Skills following the Agent Skills specification, packaged as a Claude Code plugin marketplace via .claude-plugin/marketplace.json.
- Name: loop-skills
- GitHub: donnfelker/loop-skills
- License: MIT
Every plugin here is a bounded autonomous loop: it drives an artifact to a terminal state, checks an explicit termination condition (quiet round, two clean passes, a cap), and commits per round for an audit trail.
Repository Structure
plugins/
└── plugin-name/
├── .claude-plugin/
│ └── plugin.json # Plugin manifest (name, description, version, license)
├── references/ # Optional - plugin-wide docs cited via ${CLAUDE_PLUGIN_ROOT}/references/...
└── skills/
└── skill-name/
├── SKILL.md # Required skill file (<500 lines)
├── references/ # Optional - skill-local docs loaded on demand
├── scripts/ # Optional - executable code
└── assets/ # Optional - templates, data files
Build / Lint / Test Commands
Skills are content-only (no build step). Validate with:
./validate-skills.sh plugins/*/skills/
Manually verify: YAML frontmatter is valid; name matches the directory exactly; name is 1-64 chars, lowercase alphanumeric and hyphens; description is 1-1024 characters.
Required Frontmatter
---
name: skill-name
description: What this skill does and when to use it. Include trigger phrases.
---
| Field | Required | Constraints |
|---|---|---|
name |
Yes | 1-64 chars, lowercase a-z, numbers, hyphens. Must match dir. |
description |
Yes | 1-1024 chars. Describe what it does and when to use it. |
license |
No | License name (default: MIT) |
metadata |
No | Key-value pairs (author, version, etc.) |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 98 lines · 1,257 tokens per session scan A 4e54b0118d75
loop-skills AGENTS.md is an instructions file published in the GitHub repository donnfelker/loop-skills (19 stars, last pushed 2mo ago), licensed MIT. It adds 1,257 tokens to every session, about $0.0050 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
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Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
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